A) $ 4.43\times 10^{25}\ lm $
B) $ 4.43\times 10^{26}\ lm $
C) $ 4.43\times 10^{27}\ lm $
D) $ 4.43\times 10^{28}\ lm $
Correct Answer: D
$ \varphi =4\pi L=4\times 3.14\times 3.53\times 10^{27} $
$ =4.43\times 10^{28}lumen. $
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